Site-selective preparation of two-dimensional dipolar quantum gases in an optical beat-note lattice

TL;DR

The paper introduces an all-optical, high-resolution method for selecting individual atomic layers in two-dimensional dipolar quantum gases, enhancing stability and precision for quantum research.

Contribution

It presents a novel optical technique using a beat-note superlattice and passive stabilization for deterministic layer selection in dipolar quantum gases.

Findings

Successfully isolated single and bilayer atomic samples with high precision.

Achieved passive stabilization of lattice planes against experimental drifts.

Enabled robust, layer-specific quantum gas preparation for future studies.

Abstract

High-resolution microscopy of two-dimensional dipolar quantum gases requires selecting individual atomic layers, a task complicated for strongly magnetic lanthanide atoms by the limited applicability of standard magnetic-gradient techniques. We present an all-optical method for the deterministic spatial selection of single- and bilayer samples of cold dipolar atoms using spatially selective parametric heating within a beat-note superlattice. By utilizing a high-resolution microscope objective as a common retroreflector for both optical frequency components, the lattice planes are passively stabilized. This renders their positions exceptionally robust against experimental drifts and structure-borne vibrations, even eliminating the need for active laser stabilization over millimeter-scale separations from the reflecting surface. We validate this approach by demonstrating the robust isolation of one or two atomic layers in precise coincidence with the focal plane of our objective. This enables future single-atom-resolved studies of long-range interacting systems.